I've said before there's a point where the limiting factor is just that echoing strikes will always have a mediocre aoe in a cone where other spells like blood boil can hit everything in all directions
Its easy enough to hit 125 fcr and still have max resists, enough damage to one-shot everything and every QoL possible.
Say you want meditation aura, redemption aura, cleansing aura, max resists, 125 fcr, high damage, a merc that doesn't overwrite amp and die without leech.
Okay, obsession, enigma, 2/20 circlet, highlords, laying of hands, phoenix, 2x opalvein, arachs, gore riders, might merc with insight coh cure. Even with 0 resist on circlet, no jewel and not a single sc you're already 90/85/56/56% resists, with the potential for about 80% more resist all in those slots. hell you can use mf scs
maybe some other setups can get more potential dps. You already oneshot unique ghoul lords / frenzytaurs in p8 hell so whats the difference, 50-75k LCS damage with 65.7% ds/cs and another 350% to demons / 50% undead.